我正在处理这段代码,我需要过滤一个包含多个相同元素的数组,看起来像这样;
vacant = [
"A510.4 - 0h 45 m",
"A520.6 - 3h 0 m",
"A250.1 - 3h 0 m",
"A340.1 - 3h 15 m",
"A320.2 - 3h 0 m",
"A240.4 - 4h 0 m",
"A210.3 - 4h 0 m",
"A520.5 - 5h 0 m",
"A250.1 - 6h 0 m",
"A240.4 - 7h 0 m",
"A320.6 - 8h 0 m",
"A340.1 - 8h 0 m"]
uniqueVacant
- 数组中的相同元素是:
A250.1 - 3h 0 m / A250.1 - 6h 0 m
A340.1 - 3h 15 m / A340.1 - 8h 0 m
A240.4 - 4h 0 m / A240.4 - 7h 0 m
我已经从元素中过滤掉了时间戳,所以唯一需要的是比较元素名称;
function getName(str) {
return str.substring(0, str.indexOf('-'));
}
var uniqueVacant = [];
vacant.forEach(function (vacantStr) {
uniqueVacant.push(getName(vacantStr))
});
结果应如下所示,只留下第一个具有相同名称的元素,并删除后来打印出来的第二个元素;
uniqueVacant = [
"A510.4 - 0h 45 m",
"A520.6 - 3h 0 m",
"A250.1 - 3h 0 m",
"A340.1 - 3h 15 m",
"A320.2 - 3h 0 m",
"A240.4 - 4h 0 m",
"A210.3 - 4h 0 m",
"A520.5 - 5h 0 m",
"A320.6 - 8h 0 m"]
// Removed A250.1 - 6h 0 m, A340.1 - 8h 0 m, A240.4 - 7h 0 m,
请注意,当计时器为元素时,它们会从数组中删除,然后具有相同名称的第二个元素应该出现在数组中,如果数组内部没有更多的相似之处
相似之处也每天都有所不同,有时它只有2个相似元素,其他日子可能是8个或更多。
任何快速有效的方法吗?
答案 0 :(得分:1)
尝试使用Array#reduce
var vacant = [
"A510.4 - 0h 45 m",
"A520.6 - 3h 0 m",
"A250.1 - 3h 0 m",
"A340.1 - 3h 15 m",
"A320.2 - 3h 0 m",
"A240.4 - 4h 0 m",
"A210.3 - 4h 0 m",
"A520.5 - 5h 0 m",
"A250.1 - 6h 0 m",
"A240.4 - 7h 0 m",
"A320.6 - 8h 0 m",
"A340.1 - 8h 0 m"
]
console.log(vacant.reduce((a, b) => {
var k = a.map(a => a.split('-')[0])
if (!k.includes(b.split("-")[0])) {
a.push(b)
k.push(b.split("-")[0])
}
return a;
}, []))